WO2021117104A1

WO2021117104A1 - Alignment film, display device, method for producing display device, liquid crystal alignment agent, and liquid crystal composition

Info

Publication number: WO2021117104A1
Application number: PCT/JP2019/048128
Authority: WO
Inventors: 真伸水崎
Original assignee: シャープ株式会社
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2021-06-17
Also published as: US20230046964A1

Abstract

The liquid crystal alignment film (53 · 55) comprises a copolymer of a prescribed vertical alignment monomer and monomer that is a prescribed anthracene-type monomer and/or a prescribed benzil-type monomer.

Description

Alignment film, display device, manufacturing method of display device, liquid crystal alignment agent, and liquid crystal composition

The present disclosure relates to an alignment film, a display device, a method for manufacturing a display device, a liquid crystal alignment agent, and a liquid crystal composition.

The display of the reflective liquid crystal display device is difficult to see when the surrounding environment is dark. On the other hand, a display device using a self-luminous element such as an OLED (organic light emitting diode) has high brightness, but its visibility is deteriorated in an environment with high peripheral brightness (bright environment).

Therefore, as a solution to such a problem, a display device that combines a reflective liquid crystal display device and a self-luminous element such as an OLED is being developed.

Japanese Patent Registration Gazette "Patent No. 6437697 Gazette"

However, in the liquid crystal display device, it is necessary to form an alignment film for aligning the liquid crystal. As a method for forming an alignment film, a method of applying a polymer solution such as polyamic acid as an alignment agent and then firing at a high temperature of 200 ° C. or higher to remove the solvent is common. However, such high-temperature firing causes damage such as a decrease in emission brightness due to heat to the self-luminous element. Further, when a flexible substrate made of polyimide, polycarbonate or the like is used as the support, if high-temperature firing is performed, there is a possibility that contrast will not be obtained when the reflective liquid crystal display device is displayed. This is because the retardation value slightly possessed by polyimide, polycarbonate, etc. changes due to high-temperature firing.

As a method for forming an alignment film, a method called PSA (Polymer Sustained Alignment) technology, which does not require high-temperature firing, is also known. In PSA technology, a liquid crystal material containing a photopolymerizable monomer is sealed between a pair of substrates constituting a liquid crystal cell, and a voltage is applied to the liquid crystal layer, and an active energy ray such as ultraviolet rays is irradiated to the above light. This is a technique for polymerizing a polymerizable monomer.

However, the reflective liquid crystal display device performs color display by including a reflecting plate (for example, a self-luminous element such as an OLED) on one substrate and introducing a color conversion layer such as a color filter on the other substrate. Since metal is used for forming thin film transistors, wiring, and the like on an array substrate (active substrate) provided with a self-luminous element such as an OLED, it is not possible to irradiate ultraviolet rays from the array substrate side. Further, it is not possible to irradiate ultraviolet rays from the substrate side provided with the color conversion layer. Therefore, it is impossible to form an alignment film by irradiating ultraviolet light from the outside of the liquid crystal cell.

Therefore, in order to form an alignment film without high-temperature firing, there is no choice but to polymerize the monomer introduced into the liquid crystal layer by irradiating the inside of the liquid crystal cell with visible light to near-ultraviolet light.

However, conventionally, a monomer that can be vertically oriented by irradiation with visible light to near-ultraviolet light, or a combination of a plurality of monomers is not known. As a result of diligent studies by the inventors of the present application, although there was a material that could be polymerized with visible light, the liquid crystal molecules could not be oriented with that material.

One aspect of the present disclosure is made in view of the above problems, and an alignment film and a display device that can be formed without high-temperature firing, a method for manufacturing the display device, and the alignment film and display. It is an object of the present invention to provide a liquid crystal alignment agent and a liquid crystal composition used in the manufacture of an apparatus.

As a result of diligent studies to solve the above problems, the inventors of the present application have found a combination of monomers that can be copolymerized with near-ultraviolet light to visible light and that can orient liquid crystal molecules by copolymerization. The invention was completed.

In order to solve the above problems, the alignment film according to one aspect of the present disclosure is an alignment film that orients a liquid crystal, and the alignment film is at least a first monomer represented by the following general formula (1). And a copolymer with at least one of the second monomer represented by the following general formula (2) and the third monomer represented by the following general formula (3).

In the above general formula (1), X ¹ and X ² independently represent -H, -CH ₃ , or -C ₂ H ₅ , and Z is -O-, -S-, and -NH-. , -CO -, - COO -, - OCO-, or a direct bond, ^{Y 1} and ^{Y 2} are each independently, -H, -F, -Cl, -Br, straight having 1 to 6 carbon atoms It represents a chain, branched or cyclic alkyl group, or a linear, branched or cyclic alkyloxy having 1 to 6 carbon atoms, m represents an integer of 6 to 16, and n represents 8 to 24. Represents an integer of.

In the above general formula (2), R ¹ and R ² independently represent a hydrogen atom or a methyl group, respectively.

In the above general formula (3), R ³ and R ⁴ independently represent a hydrogen atom or a methyl group, respectively.

In order to solve the above problems, the display device according to one aspect of the present disclosure includes a thin film transistor layer including a plurality of thin film transistors between the first insulating substrate and the second insulating substrate, and a plurality of light emitting elements. The light emitting element layer, the first alignment film, the liquid crystal layer, and the second alignment film are provided in this order from the first insulating substrate side, and the first alignment film and the second alignment film are provided in this order. At least one of the films is the alignment film according to one aspect of the present disclosure.

In order to solve the above-mentioned problems, the method for manufacturing the display device according to one aspect of the present disclosure is the method for manufacturing the above-mentioned display device according to one aspect of the present disclosure, wherein the first insulating substrate and the thin film transistor are used. Between the step of forming the array substrate having the layer and the light emitting element layer, the step of forming the opposed substrate having the second insulating substrate, and the liquid crystal material between the array substrate and the opposed substrate, A step of forming a liquid crystal layer by encapsulating a liquid crystal composition containing at least the first monomer, the second monomer, and at least one of the third monomers, and causing the light emitting element to emit light. Thereby, at least the first monomer, the second monomer, and at least one of the third monomers are copolymerized, and the array substrate is brought into contact with the liquid crystal layer to obtain the above. While forming the first alignment film, the facing substrate includes a step of contacting the liquid crystal layer to form the first alignment film.

In order to solve the above problems, the liquid crystal alignment agent according to one aspect of the present disclosure includes a first monomer represented by the general formula (1), a second monomer represented by the general formula (2), and a second monomer represented by the general formula (2). It contains at least one of the third monomers represented by the general formula (3).

In order to solve the above problems, the liquid crystal composition according to one aspect of the present disclosure includes the above liquid crystal alignment agent according to one aspect of the present disclosure and a liquid crystal material.

The first monomer and at least one of the second monomer and the third monomer can be copolymerized with near-ultraviolet light to visible light, and the liquid crystal molecules are oriented by the copolymerization. be able to. Therefore, according to one aspect of the present disclosure, an alignment film and a display device that can be formed without high-temperature firing, a method for manufacturing the display device, and a liquid crystal alignment used for manufacturing the alignment film and the display device. Agents and liquid crystal compositions can be provided.

It is sectional drawing which shows the schematic structure of the main part of the display device which concerns on one Embodiment. It is a flowchart which shows the manufacturing method of the display device which concerns on one Embodiment. It is a flowchart which shows the array substrate forming process shown in FIG. It is a flowchart which shows the facing substrate forming process shown in FIG. It is sectional drawing which shows the schematic structure of the main part before forming the alignment film of the display device which concerns on one Embodiment. It is a graph which shows the emission spectrum of the blue OLED used in Example 1. It is a graph which shows the absorption spectrum of the anthracene-based monomer used in Example 1. It is a figure which shows side by side the light transmission state of the liquid crystal cell at the time of no voltage application before and after lighting of the blue OLED of the liquid crystal cell obtained in Example 1. It is a graph which shows the absorption spectrum of the benzyl-based monomer used in Example 2. It is a figure which shows side by side the light transmission state of the liquid crystal cell at the time of no voltage application before and after lighting of the blue OLED of the liquid crystal cell obtained in Example 2. It is a figure which shows side by side the light transmission state of the liquid crystal cell at the time of no voltage application before and after lighting of the blue OLED of the liquid crystal cell obtained in Comparative Example 1. It is a figure which shows side by side the light transmission state of the liquid crystal cell at the time of no voltage application before and after lighting of the blue OLED of the liquid crystal cell obtained in the comparative example 2.

An embodiment of the present disclosure will be described with reference to FIGS. 1 to 12.

<Outline configuration of display device>
FIG. 1 is a cross-sectional view showing a schematic configuration of a main part of the display device 100 according to the present embodiment. Note that FIG. 1 shows the orientation state of the liquid crystal molecules 54a when no voltage is applied.

As shown in FIG. 1, the display device 100 includes an array substrate 10, an opposing substrate 70, a liquid crystal layer 54 sandwiched between the array substrate 10 and the opposing substrate 70, and an array substrate 10 on the opposing substrate 70. Is provided with a circular polarizing plate 8 provided on the opposite side.

The array substrate 10 is an electrode substrate (element substrate) in which a light emitting element 31 and a pixel electrode 52 are formed for each pixel P. The array substrate 10 has a thin film transistor layer (hereinafter referred to as “TFT layer”) 2, a light emitting element layer 3, an insulating layer 4, a plurality of pixel electrodes 52, and an alignment film 53 on an insulating substrate 1 (first insulating substrate). (First alignment film) has a structure in which they are laminated in this order. The light emitting element layer 3 is provided with a plurality of light emitting elements 31.

On the other hand, the counter substrate 70 is an electrode substrate having a common electrode 56 common to all pixels P as a counter electrode facing the pixel electrode 52 with the liquid crystal layer 54 interposed therebetween. The facing substrate 70 has a configuration in which a color conversion layer 6, a common electrode 56, and an alignment film 55 (second alignment film) are laminated in this order on an insulating substrate 7 (second insulating substrate). ..

The array substrate 10 and the opposing substrate 70 have the forming surfaces of the layers formed on the array substrate 10 and the opposing substrate 70 inside so that the liquid crystal element 51 is formed between the pair of insulating

substrates

1 and 7. They are arranged so as to face each other. The array substrate 10 and the facing substrate 70 are adhered to each other at their outer peripheral portions with a sealant (not shown) with a certain gap.

The liquid crystal element 51 is composed of a pixel electrode 52, an alignment film 53, a liquid crystal layer 54, an alignment film 55, and a common electrode 56. The layer provided with the pixel electrode 52, the alignment film 53, the liquid crystal layer 54, the alignment film 55, and the common electrode 56 is the liquid crystal element layer 5. A plurality of liquid crystal elements 51 are provided on the liquid crystal element layer 5.

Therefore, in the display device 100, the TFT layer 2, the light emitting element layer 3, the insulating layer 4, the liquid crystal element layer 5, and the color conversion layer 6 are sandwiched between the pair of insulating

substrates

1 and 7, and the insulating substrate in the insulating substrate 7 is sandwiched. It can also be said that it has a configuration in which the circular polarizing plate 8 is provided on the surface opposite to 1.

Insulating

substrates

1 and 7 are supports (base substrates) having insulating properties. Of the insulating

substrates

1 and 7, a transparent insulating substrate is used for at least the insulating substrate 7 on the light extraction side. The insulating

substrates

1 and 7 may be, for example, glass substrates, but are preferably flexible substrates such as plastic substrates and resin films. Examples of the material of these flexible substrates (that is, the material of the plastic substrate or the material of the resin film) include polyimide and polycarbonate. In particular, by using a resin film for the insulating

substrates

1 and 7, a thin film can be formed, and a foldable display device can be obtained as the display device 100.

The display device 100 is provided with a plurality of pixels P, for example, in a matrix. The TFT layer 2 includes a light emitting element pixel circuit that controls each light emitting element 31 in the light emitting element layer 3, a liquid crystal element pixel circuit that controls the liquid crystal element 51 in the liquid crystal element layer 5 for each pixel P, and these light emitting elements. A flattening film 23 that covers the pixel circuit and the pixel circuit for the liquid crystal element is provided.

The pixel circuit for a light emitting element includes a plurality of first thin film transistors (hereinafter, referred to as "first TFT") 21 for driving each light emitting element 31. The pixel circuit for a liquid crystal element includes a plurality of second thin film transistors (hereinafter, referred to as “second TFTs”) 22 that drive the liquid crystal element 51 for each pixel P. Further, the TFT layer 2 is provided with a plurality of bus lines (not shown) electrically connected to the first TFT 21 and the second TFT 22. These plurality of bus lines include a plurality of gate bus lines and a plurality of source bus lines.

Multiple gate bus lines are provided in the row direction in the display area. A plurality of source bus lines are provided in the column direction in the display area so as to intersect each gate bus line. Each region surrounded by these gate bus lines and source bus lines is a pixel P. The first TFT 21 and the second TFT 22 are provided for each pixel P, respectively.

The gate electrode of the second TFT 22 is connected to the gate bus line, and the source electrode (or drain electrode) of the second TFT 22 is connected to the source bus line. Further, the drain electrode (or source electrode) of the second TFT 22 is connected to the gate electrode of the first TFT 21 and the pixel electrode 52 of the liquid crystal element 51. Further, the source electrode (or drain electrode) of the first TFT 21 is connected to a current supply bus line (not shown) that supplies a current to the light emitting element 31. The drain electrode (or source electrode) of the first TFT 21 is connected to the first electrode 32 described later in the light emitting element 31.

Therefore, the second TFT 22 electrically connects the first TFT 21 and the liquid crystal element 51 with the source bus line based on the potential of the gate bus line.

The first TFT 21 changes the magnitude of the current supplied to the light emitting element 31 based on the potential of the source bus line. When the first TFT 21 is turned ON, a drive current flows through the current supply bus line and the drain electrode (or source electrode) of the first TFT 21 to the light emitting element 31, and the light emitting layer emits light.

The flattening film 23 covers the plurality of first TFTs 21, the plurality of second TFTs 22, and the plurality of bus lines. The flattening film 23 is an insulating film made of an organic insulating material such as acrylic resin or polyimide. The flattening film 23 flattens the irregularities on the first TFT 21, the second TFT 22, and the bus line. For the flattening film 23, for example, an organic insulating film such as an acrylic resin or polyimide is used.

The light emitting element layer 3 is provided on the flattening film 23 of the TFT layer 2. The light emitting element layer 3 includes a plurality of light emitting elements 31 and a bank 35.

The light emitting element 31 has a configuration in which at least a functional layer 33 including a light emitting layer is sandwiched between the first electrode 32 and the second electrode 34. In the following, as an example, a case where the light emitting element 31 is an OLED (organic light emitting diode) will be described as an example.

The first electrode 32 is formed on the flattening film 23 in an island shape for each pixel P. The second electrode 34 is a solid electrode (common electrode) commonly provided on all pixels P.

The light emitting element 31 is a top emission type light emitting element. Therefore, the upper second electrode 34 is formed of a translucent electrode made of a light-transmitting material, and the lower first electrode 32 is formed of a reflective electrode made of a light-reflecting material.

As the translucent material, for example, a transparent conductive film material can be used. As the transparent conductive film material, for example, ITO (indium tin oxide), IZO (indium zinc oxide) and the like can be used. Since these materials have high visible light transmittance, the luminous efficiency is improved.

As the light-reflecting material, for example, a metal material such as Al (aluminum), Ag (silver), Cu (copper), Au (gold), APC (AgPdCu) can be used. Since these materials have high visible light reflectance, the luminous efficiency is improved.

Further, the first electrode 32 may be a reflective electrode having light reflectivity by forming a laminate of a layer made of a translucent material and a layer made of a light-reflecting material. Further, by forming a reflective film made of, for example, APC or the like in a solid shape on the flattening film 23 and forming a layer made of a translucent material in an island shape on the reflective film, the reflection having light reflectivity is obtained. It may be used as an electrode.

The functional layer 33 may be a light emitting layer, or may be a laminated film having a multilayer structure including a light emitting layer and a carrier transport layer that transports carriers to the light emitting layer. Further, the functional layer 33 may further include a carrier injection layer that injects carriers into the carrier transport layer. For example, when the first electrode 32 is an anode and the second electrode 34 is a cathode, the functional layer 33 has a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection in this order from the lower layer side. It may have a structure in which layers are laminated. When the first electrode 32 is a cathode and the second electrode 34 is an anode, the stacking order of the hole injection layer, the hole transport layer, the light emitting layer, the electron transport layer, and the electron injection layer is reversed. Of course, a configuration that does not form one or more of the hole injection layer, the hole transport layer, the electron transport layer, and the electron injection layer is also possible.

Bank 35 is formed in a grid pattern, for example. The bank 35 functions as a pixel separation wall that separates the light emitting element 31 for each pixel P, and also functions as an edge cover that covers each edge of the first electrode 32. For the bank 35, for example, an organic insulating material such as acrylic resin or polyimide is used.

The light emitting layer is formed in an island shape for each opening 35a of the bank 35 (in other words, for each pixel P). The layers other than the light emitting layer in the functional layer 33 may be formed in an island shape for each opening 35a of the bank 35, or may be formed in a solid shape as a common layer common to all pixels P.

As described above, at least the light emitting layer in the first electrode 32 and the functional layer 33 is separated into islands for each pixel P by the bank 35. As a result, the display device 100 is provided with a plurality of light emitting elements 31 corresponding to the pixels P.

When the light emitting element 31 is an OLED, an organic layer is used for the functional layer 33. The light emitting elements 31 are all light emitting elements that emit near-ultraviolet to blue light having emission peak wavelengths in the wavelength band of 360 nm or more and 500 nm or less, and when the light emitting element 31 is energized, the light emitting elements 31 are near-ultraviolet to blue. The light emitting material of the light emitting layer is selected so that light emission can be obtained. Therefore, in the present embodiment, each of the light emitting elements 31 emits light in a color common to each pixel P. Therefore, light of the same color is emitted from the entire light emitting element layer 3.

In the present embodiment, the near-ultraviolet light (near-ultraviolet light) refers to light having an emission peak wavelength in a wavelength band of 360 nm or more and less than 400 nm. Further, blue light (blue light) refers to light having an emission peak wavelength in a wavelength band of 400 nm or more and 500 nm or less. It is more preferable that the light emitting element 31 has an emission peak wavelength in a wavelength band of 420 nm or more and 490 nm or less.

The light emitting element 31 is covered with a translucent insulating layer 4 formed on the light emitting element layer 3. The insulating layer 4 contains an inorganic layer and functions as a sealing layer for preventing deterioration of the light emitting element 31 due to the infiltration of moisture and oxygen. Further, it is desirable that the insulating layer 4 functions as a flattening layer for flattening the unevenness on the light emitting element 31, and it is desirable that the insulating layer 4 further contains an organic layer.

Therefore, the insulating layer 4 is formed of an inorganic layer or a laminate of an inorganic layer and an organic layer. It is desirable that the insulating layer 4 has a structure in which, for example, a first inorganic layer, an organic layer, and a second inorganic layer are laminated in this order. The inorganic layer (for example, the first inorganic layer and the second inorganic layer) has a moisture-proof function of preventing the infiltration of water and oxygen, and functions as a barrier layer (moisture-proof layer). On the other hand, the organic layer functions as a buffer layer. The organic layer relaxes the stress of the inorganic layer, flattens it by filling the stepped portion on the surface of the light emitting element 31, cancels out pinholes, suppresses the occurrence of cracks and film peeling during lamination of the inorganic layer, and the like.

For the inorganic layer, for example, a translucent inorganic insulating film such as silicon nitride (SiN) or silicon oxide (SiO _{2) is used.} For the organic layer, for example, an organic insulating film having translucency such as acrylic resin or polyimide is used.

A liquid crystal element layer 5 is formed on the insulating layer 4. The liquid crystal element layer 5 is provided with a liquid crystal element 51 for each pixel P. As described above, the pixel electrode 52 and the alignment film 53 in the liquid crystal element 51 are formed on the array substrate 10. The pixel electrodes 52 are formed on the insulating layer 4 in an island shape for each pixel P. The pixel electrode 52 is connected to the second TFT 22 via a contact hole 4a provided in the insulating layer 4 and a contact hole 35b provided in the bank 35. The alignment film 53 is formed solidly on the insulating layer 4 so as to cover all the pixel electrodes 52 as a common layer common to all the pixels P.

On the other hand, the alignment film 55 and the common electrode 56 are formed on the facing substrate 70. As described above, the common electrode 56 is formed in a solid shape on the color conversion layer 6 of the opposed substrate 70 as a common layer common to all pixels P. Further, the alignment film 55 is formed in a solid shape on the common electrode 56 as a common layer common to all pixels P. The alignment film 53 and the alignment film 55 are provided in contact with the liquid crystal layer 54 with the liquid crystal layer 54 interposed therebetween. The liquid crystal layer 54 is sandwiched between the array substrate 10 and the opposing substrate 70 by enclosing the liquid crystal in the gap formed between the array substrate 10 and the opposing substrate 70.

The pixel electrode 52 and the common electrode 56 are translucent electrodes formed of a translucent material. As the translucent material, a transparent conductive film material such as ITO or IZO can be used.

An electric field is applied to the liquid crystal layer 54 by the voltage applied to the pixel electrode 52 and the common electrode 56, whereby an image is formed.

The liquid crystal element 51 is a liquid crystal element that displays by a vertically oriented method (for example, a VA method), and the liquid crystal layer 54 is a vertically oriented liquid crystal layer. The liquid crystal molecule 54a has a negative dielectric anisotropy.

The

alignment films

53 and 55 direct the liquid crystal molecules 54a of the liquid crystal layer 54 in a direction perpendicular to the surfaces of the array substrate 10 and the opposing substrate 70 (specifically, perpendicular to the substrate surfaces of the insulating substrates 1.7) when no voltage is applied. It is a vertically oriented film that is oriented in the above direction.

In the present embodiment, the liquid crystal molecules 54a are vertically oriented (vertically oriented) with respect to the substrate surface of the insulating

substrates

1 and 7 when no voltage is applied, and the liquid crystal molecules 54a are collapsed when the voltage is applied to display the display. The

alignment films

53 and 55 will be described in detail later.

A circularly polarizing plate 8 is provided on the outside of the liquid crystal cell formed by sandwiching the liquid crystal layer 54 between the array substrate 10 and the facing substrate 70. The circularly polarizing plate 8 is formed in a solid shape on the surface of the insulating substrate 7 opposite to the insulating substrate 1 as a common layer common to all pixels P.

The circularly polarizing plate 8 has a function of transmitting only specific circularly polarized light from the incident external light. The circular polarizing plate 8 is formed by, for example, laminating a linear polarizing plate and a λ / 4 wave plate with their optical axes tilted by a certain angle.

For example, the liquid crystal element 51 becomes a dark display and displays black when no voltage is applied, while the reflectance gradually increases due to the voltage application, becomes a bright display, and displays white. In order to suppress the reflection of external light, the liquid crystal element 51 is configured to be in the NB (normally black) mode by the cooperation of the circularly polarizing plate 8, the

alignment film

53 and 55, and the liquid crystal layer 54. It is desirable to be there. In the liquid crystal layer 54, the dielectric anisotropy of the liquid crystal material is selected so that the liquid crystal molecules 54a are vertically oriented when no voltage is applied.

The liquid crystal element 51 is a reflective liquid crystal element, and external light transmitted through the circular polarizing plate 8 and incident on the liquid crystal element 51 passes through the liquid crystal element 51 and the second electrode 34 of the light emitting element 31 and emits light. It is reflected by the first electrode 32 of 31. Then, the light reflected by the first electrode 32, transmitted through the second electrode 34 and the liquid crystal element 51, and then transmitted through the circularly polarizing plate 8 is emitted to the outside.

The display device 100 has, as the pixel P, a red pixel RP that emits red light, a green pixel GP that emits green light, and a blue pixel BP that emits blue light.

Therefore, the display device 100 is provided with a color conversion layer 6 so that both the liquid crystal element 51 and the light emitting element 31 can display colors. As described above, each pixel P is provided with a light emitting element that emits near-ultraviolet to blue light as a light emitting element 31. When the light emitting element 31 is a light emitting element (blue light emitting element) that emits blue light, the pixel RP has blue light emitted from the light emitting layer of the light emitting element 31 provided on the pixel RP as a color conversion layer 6. Is provided with a color conversion layer 6R that converts light into red light. As the color conversion layer 6, the pixel GP is provided with a color conversion layer 6G that converts blue light emitted from the light emitting layer of the light emitting element 31 provided in the pixel GP into green light. The pixel BP may be provided with a color conversion layer 6B that transmits blue light emitted from the light emitting layer of the light emitting element 31 provided in the pixel BP as it is, or a normal blue color that transmits blue light. A filter may be provided. Of course, the color conversion layer 6B may not be provided with the color conversion layer.

When the light emitting element 31 is a light emitting element (near ultraviolet light emitting element) that emits near-ultraviolet light, the pixel RP is emitted from the light emitting layer of the light emitting element 31 provided in the pixel RP as a color conversion layer 6. A color conversion layer 6R for converting the near-ultraviolet light to be red light is provided. As the color conversion layer 6, the pixel GP is provided with a color conversion layer 6G that converts near-ultraviolet light emitted from the light emitting layer of the light emitting element 31 provided in the pixel GP into green light. As the color conversion layer 6, the pixel BP is provided with a color conversion layer 6B that converts near-ultraviolet light emitted from the light emitting layer of the light emitting element 31 provided in the pixel BP into blue light.

Here, red light refers to light having an emission peak wavelength in a wavelength band of 600 nm or more and 780 nm or less. Further, green light refers to light having an emission peak wavelength in a wavelength band of 500 nm or more and 600 nm or less.

For such a color conversion layer 6, for example, a color conversion layer using quantum dots is used. For example, as the color conversion layer 6R, a color conversion layer having quantum dots having a red perovskite crystal structure that absorbs blue light or near-ultraviolet light emitted by the light emitting element 31 and emits red light is used. As the color conversion layer 6G, a color conversion layer having quantum dots having a green perovskite crystal structure that absorbs blue light or near-ultraviolet light emitted by the light emitting element 31 and emits green light is used. As the color conversion layer 6B, a color conversion layer having quantum dots having a blue perovskite crystal structure that absorbs blue light or near-ultraviolet light emitted by the light emitting element 31 and emits blue light is used.

<Orientation film 53.55>
Next, the

alignment films

53 and 55 will be described. The

alignment films

53 and 55 are polymerization orientation layers that polymerize with near-ultraviolet or blue light.

The

alignment films

53 and 55 include at least one of the first monomer and the second monomer and the third monomer (that is, one or both of the second monomer and the third monomer). And are formed by a liquid crystal aligning agent containing. Specifically, the alignment film 53.55 has at least one of the first monomer, the second monomer, and the third monomer (that is, the second monomer and the third monomer). It can be formed by copolymerizing with one or both of the monomers of the above.

The first monomer is a vertically oriented monomer (first monomer) represented by the following general formula (1).

In the above general formula (1), X ¹ and X ² independently represent -H, -CH ₃ , or -C ₂ H _5. Z represents -O-, -S-, -NH-, -CO-, -COO-, -OCO-, or direct binding. Y ¹ and Y ² are independently each of -H, -F, -Cl, -Br, a linear, branched or cyclic alkyl group having 1 to 6 carbon atoms, or an alkyl group having 1 to 6 carbon atoms. Represents a linear, branched or cyclic alkyloxy. m represents an integer of 6 to 16, and n represents an integer of 8 to 24.

The second monomer is an anthracene-based monomer represented by the following general formula (2).

The third monomer is a benzyl-based monomer represented by the following general formula (3).

Therefore, the

alignment films

53 and 55 contain at least a copolymer of the first monomer and at least one of the second monomer and the third monomer. Therefore, the copolymer contains at least a structural unit derived from the first monomer and a structural unit derived from at least one of the second monomer and the third monomer. ..

The structural unit derived from the first monomer has, for example, a structure represented by the following general formula (1-A) or (1-B).

The structural unit derived from the second monomer has, for example, a structure represented by the following general formula (2-A) or (2-B).

The structural unit derived from the third monomer has, for example, a structure represented by the following general formula (3-A) or (3-B).

In the general formulas (1-A) and (1-B), X ¹ , X ² , Y ¹ , Y ² , m, n, R ¹ , R ² , R ³ , and R ⁴ are the general formulas (1). It is the same as X ¹ , X ² , Y ¹ , Y ² , m, and n in. Further, ^R 1, ^{R 2} in the formula (2-A) and (2-B) is the same as ^R 1, ^{R 2} in the general formula (2). ^R 3, ^{R 4} in the formula (3-A) and (3-B) is the same as ^R 3, ^{R 4} in the general formula (3).

Examples of the copolymer containing the structural unit derived from the first monomer and the structural unit derived from the second monomer include the copolymer represented by the following structural formula (4).

^{^{^{^{Incidentally, X 1, X 2, Y}}}} 1, Y 2, m, n, R 1, R 2, R 3, R 4 in the structural formula (4) is, ^X 1 in the general formula ^{(1), X} 2, Same as Y ¹ , Y ² , m, n. Further, ^R 1, ^{R 2} in the structural formula (4) is the same as ^R 1, ^{R 2} in the general formula (2). In the structural formula (4), p represents an integer of 1 to 100, q represents an integer of 1 to 50, r represents an integer of 1 to 100, and s represents an integer of 1 to 100. Represents an integer.

Further, examples of the copolymer containing the structural unit derived from the first monomer and the structural unit derived from the third monomer include the copolymer represented by the following structural formula (5). Be done.

^{^{^{^{Incidentally, X 1, X 2, Y}}}} 1, Y 2, m, n, R 1, R 2, R 3, R 4 in the structural formula (5) is, ^X 1 in the general formula ^{(1), X} 2, Same as Y ¹ , Y ² , m, n. Also, ^R 3, ^{R 4} in the structural formula (5) is the same as ^R 3, ^{R 4} in the general formula (3). In the structural formula (5), p represents an integer of 1 to 100, q represents an integer of 1 to 50, r represents an integer of 1 to 100, and s represents an integer of 1 to 100. Represents an integer.

As described above, the copolymer constituting the

alignment films

53 and 55 includes at least one of the structural unit derived from the first monomer and at least one of the second monomer and the third monomer. It may contain a structural unit derived from a monomer.

Therefore, the copolymer constituting the

alignment films

53 and 55 includes a structural unit derived from the first monomer, a structural unit derived from the second monomer, and a structural unit derived from the third monomer. , May be included. Examples of such a copolymer include a copolymer having both the structure represented by the structural formula (4) and the structure represented by the structural formula (5).

Further, the

alignment films

53 and 55 are the copolymers represented by the structural formula (4) and the copolymers represented by the structural formula (5) as the copolymers constituting the

alignment films

53 and 55. It may contain at least one copolymer. In other words, the copolymer constituting the

alignment films

53 and 55 is a copolymer of at least one of the copolymer represented by the structural formula (4) and the copolymer represented by the structural formula (5). May include.

Specific examples of the first monomer include the monomers represented by the following structural formulas (1-1) to (1-8).

Only one type of these monomers may be used, or two or more types may be mixed and used as appropriate. Therefore, the first monomer may contain at least one of the monomers represented by the structural formulas (1-1) to (1-8). In other words, the copolymer has a structural unit derived from at least one of the monomers represented by the structural formulas (1-1) to (1-8) as a structural unit derived from the first monomer. It may be included.

The first monomer is a vertically oriented monomer. The

alignment films

53 and 55 move the liquid crystal molecules 54a of the liquid crystal layer 54 in the direction perpendicular to the surfaces of the array substrate 10 and the opposing substrate 70 by the action of the structural unit derived from the first monomer in the copolymer. It can be oriented (vertically oriented).

As described above, the liquid crystal element 51 is a liquid crystal element that displays by a vertical alignment method (VA method).

In the liquid crystal element 51, when the voltage applied to the liquid crystal layer 54 is less than the threshold voltage (including when no voltage is applied), the orientation control of the liquid crystal molecules 54a is performed by the

alignment films

53 and 55. Here, the fact that the liquid crystal molecules 54a are vertically oriented with respect to the surfaces of the array substrate 10 and the opposing substrate 70 means that the pretilt angle of the liquid crystal molecules 54a is 86 to 90 ° with respect to the surfaces of the array substrate 10 and the opposing substrate 70. Means that. The preferred pretilt angle is 88.5 to 90 °.

The pretilt angle of the liquid crystal molecules 54a is such that when the voltage applied to the liquid crystal layer 54 is less than the threshold voltage (including when no voltage is applied), the long axis of the liquid crystal molecules 54a is on the surfaces of the array substrate 10 and the facing substrate 70. It means the angle of inclination.

Since a biphenyl group (aromatic group) is introduced at the end of the alkylene group (vertically oriented group) in the first monomer, a sufficient orientation regulating force for vertically orienting the liquid crystal molecule 54a can be obtained. Further, when a halogen group (-F, -Cl, -Br) is introduced into the biphenyl group as in the monomers represented by the structural formulas (1-1) to (1-8), the liquid crystal molecule 54a is vertically inserted. Orientation control force for orientation is strengthened. On the other hand, in the monomer in which the biphenyl group is not introduced at the end of the alkylene group, the orientation regulating force for vertically aligning the liquid crystal molecule 54a becomes relatively weak, and the orientation regulating force becomes insufficient.

The first monomer is composed of an aliphatic compound except for the end of the side chain, and has a molecular structure having excellent flexibility. Therefore, in the formation of the

alignment films

53 and 55, when at least the first monomer and at least one of the second monomer and the third monomer are copolymerized, the nematic phase of the liquid crystal material of the liquid crystal layer 54 is formed. -Even if light is irradiated in an environment lower than the isotropic phase transition temperature (for example, in a normal temperature environment), a sufficient orientation regulating force for vertically aligning the liquid crystal molecules 54a can be obtained. That is, when forming the

alignment films

53 and 55, it is not necessary to irradiate the liquid crystal material in a high temperature environment equal to or higher than the nematic phase-isotropic phase transition temperature of the liquid crystal material, so that the production efficiency is improved. Here, the normal temperature means 15 to 45 ° C.

Since the first monomer is a bifunctional monomer having two acryloyl groups as polymerizable groups, the polymerization rate becomes high when the

alignment films

53 and 55 are formed, and the monomer in a non-polymerized state in the liquid crystal layer 54. Is hard to remain. As a result, a display device 100 having a high voltage holding ratio can be obtained. On the other hand, when a monofunctional monomer having only one polymerizable group is used, the polymerization rate becomes slow and a large amount of unpolymerized monomers remain in the liquid crystal layer 54, so that the voltage retention rate is large. It will drop.

Specific examples of the second monomer include monomers represented by the following structural formulas (2-1) and (2-2).

Only one type of these monomers may be used, or two or more types may be mixed and used as appropriate. Therefore, the second monomer may contain at least one of the monomers represented by the structural formulas (2-1) and (2-2). In other words, the copolymer has a structural unit derived from at least one of the monomers represented by the structural formulas (2-1) and (2-2) as a structural unit derived from the second monomer. It may be included.

Further, as the third monomer, specifically, for example, the monomers represented by the following structural formulas (3-1) and (3-2) can be mentioned.

Only one type of these monomers may be used, or two or more types may be mixed and used as appropriate. Therefore, the third monomer may contain at least one of the monomers represented by the structural formulas (3-1) and (3-2). In other words, the copolymer has a structural unit derived from at least one of the monomers represented by the structural formulas (3-1) and (3-2) as a structural unit derived from the third monomer. It may be included.

At least one of the second monomer and the third monomer initiates polymerization to initiate a copolymerization reaction between at least the first monomer and at least one of the second and third monomers. It is a functioning polymerization initiator. At least one of the second monomer and the third monomer absorbs near-ultraviolet to blue light (in other words, light having a wavelength band of 360 nm or more and 500 nm or less) to initiate polymerization.

In the present embodiment, the vertically oriented monomer and the monomer as the polymerization initiator are introduced into the liquid crystal cell together with the liquid crystal material as the liquid crystal aligning agent. As described above, the liquid crystal aligning agent containing the vertically oriented monomer and the monomer as the polymerization initiator can be copolymerized with near-ultraviolet to blue visible light, and the liquid crystal molecules 54a can be copolymerized to form the liquid crystal molecules 54a. Can be oriented. Therefore, according to the present embodiment, the liquid crystal aligning agent is photopolymerized (in other words, the monomer is copolymerized) by utilizing the light emission of the light emitting element 31 inside the liquid crystal cell, so that high temperature firing is not performed. The

alignment films

53 and 55 can be formed on the surface.

As described above, the monomer as the polymerization initiator can initiate polymerization with near-ultraviolet to blue light. Therefore, as described above, only the light emitting element that emits near-ultraviolet to blue light is used as the light emitting element 31. Therefore, according to the present embodiment, it is not necessary to divide the color pixels of the light emitting element 31, and a wide area in the pixel area can be used as the light emitting region.

Widening the light emitting region in this way eliminates the need for the light emitting element 31 to have ultra-high brightness, which is advantageous in terms of reliability. Further, by widening the light emitting region, the monomers in the liquid crystal layer 54 can be uniformly polymerized, so that the polymerization oriented layer can be uniformly formed as the

alignment films

53 and 55 over the entire display region. , The liquid crystal element layer 5 having a vertically oriented region in which the entire display region is uniform can be produced.

Also, the reflective liquid crystal element 51 has no reflection in a dark place, so the display is difficult to see. However, according to the present embodiment, by supplementing it with the light emitting element 31, the visibility can be improved even in a dark place. According to the present embodiment, as described above, each pixel P includes both the light emitting element 31 and the reflective liquid crystal element 51, so that a bright display can be achieved when the light emitting element 31 is used. In addition to being bright, the brightness of each light emitting element 31 can be lowered, so that durability (long-term reliability) can be improved.

As described above, the display device 100 according to the present embodiment is a hybrid type display device including the light emitting element 31 and the reflective liquid crystal element 51, and therefore has good visibility even in a bright surrounding environment. Further, since the formation of the

alignment films

53 and 55 does not require high-temperature firing, the high-temperature firing does not cause damage such as a decrease in the emission brightness of the light emitting element 31. Further, since it is possible to avoid changes in the retardation values of polyimide, polycarbonate and the like due to high-temperature firing, it is possible to use a flexible substrate as the insulating substrate 1.7 (support) as described above.

<Display operation of display device 100>
Next, the display operation of the display device 100 will be described.

When the display device 100 is used under external light (in other words, when the external light is strong), when the external light is incident from above the circularly polarizing plate 8, the external light passes through the circularly polarizing plate 8 to form a circle. It becomes polarized light, and for example, only right circularly polarized light passes through the circularly polarizing plate 8. At this time, when the drain voltage of the second TFT 22 is equal to or less than the threshold voltage for the liquid crystal (in other words, when the voltage applied to the liquid crystal layer 54 is less than the threshold voltage (including when no voltage is applied)), the polarized light is right circularly polarized. The external light is incident on the liquid crystal layer 54 in the vertically oriented state. Since the birefringence of the liquid crystal layer 54 is substantially zero, when no voltage is applied to the second electrode 34, the right circularly polarized light incident on the liquid crystal element 51 is directly converted into right circularly polarized light and emits light through the insulating layer 4. It enters the element 31 and reaches the first electrode 32. When this right-handed circularly polarized light is reflected by the first electrode 32, it becomes left-handed circularly polarized light, and reaches the circularly polarizing plate 8 by following a path opposite to that up to that point. At this time, the polarization state does not change depending on the liquid crystal layer 54. Therefore, the left circularly polarized light that has reached the circularly polarizing plate 8 is absorbed by the circularly polarizing plate 8 and does not pass through the circularly polarizing plate 8. Therefore, the display device 100 becomes a dark display (black display). Further, at this time, the drain voltage of the second TFT 22 is less than the threshold voltage for the light emitting element in which the first TFT 21 operates, no current is supplied to the light emitting element 31, and the non-light emitting state (in other words, the off state) is maintained. ing. In this case, the liquid crystal element 51 performs gradation display.

When the display device 100 is used under external light, if the drain voltage of the second TFT 22 is larger than the threshold voltage for the liquid crystal and smaller than the threshold voltage for the light emitting element on which the first TFT 21 operates, it passes through the circularly polarizing plate 8 and is on the right. The circularly polarized external light passes through the liquid crystal layer 54 and becomes linearly polarized light. After that, the linearly polarized light that has reached the first electrode 32 is reflected by the first electrode 32, follows a path opposite to that up to that point, and is transmitted through the liquid crystal layer 54 to become right-handed circularly polarized light, which is transmitted through the circularly polarizing plate 8. To do. Therefore, the display device 100 becomes a bright display and displays a color having a wavelength determined by the color conversion layer 6. Further, at this time, the drain voltage of the second TFT 22 is less than the threshold voltage for the light emitting element in which the first TFT 21 operates, no current is supplied to the light emitting element 31, and the non-light emitting state (in other words, the off state) is maintained. ing. Therefore, even in this case, the liquid crystal element 51 performs gradation display.

When the intensity of outside light is weak, such as indoors, the drain voltage of the second TFT 22 is set to be equal to or higher than the threshold voltage for the light emitting element in which the first TFT 21 operates. As a result, a current is supplied to the light emitting element 31, and the light emitting element 31 emits light. In this case, the light emitting element 31 performs gradation display. The on / off state of the liquid crystal element 51 does not matter. However, the normally black mode that suppresses external light is preferable. In this case, the light transmitted through the liquid crystal layer 54 becomes linearly polarized light depending on the orientation state of the liquid crystal molecules 54a. The linearly polarized light that has reached the first electrode 32 is reflected by the first electrode 32, follows a path opposite to that up to that point, becomes right-handed circularly polarized light by corriding the liquid crystal layer 54, and passes through the circularly polarizing plate 8. Therefore, also in this case, the display device 100 displays the color of the wavelength determined by the color conversion layer 6. The display device 100 can display an arbitrary color image by controlling the potentials of the individual first electrodes 32.

<Manufacturing method of display device 100>
Next, a method of manufacturing the display device 100 will be described.

FIG. 2 is a flowchart showing a manufacturing method of the display device 100 according to the present embodiment. FIG. 3 is a flowchart showing the array substrate forming step (S1) shown in FIG. FIG. 4 is a flowchart showing the facing substrate forming step (S2) shown in FIG. FIG. 5 is a cross-sectional view showing a schematic configuration of a main part of the display device 100 before forming the alignment film.

In the present embodiment, first, as shown in FIG. 2, an alignment film-less having an insulating substrate 1, a TFT layer 2, a light emitting element layer 3, an insulating layer 4, and a pixel electrode 52 as an array substrate. The array substrate 10 is formed (S1, array substrate forming step). Here, the alignment film-less array substrate 10 refers to the array substrate 10 before the alignment film 53 is formed.

On the other hand, as the facing substrate, an alignment filmless facing substrate 70 having an insulating substrate 7, a color conversion layer 6, and a common electrode 56 is formed (S2, facing substrate forming step). Here, the facing substrate 70 without the alignment film refers to the facing substrate 70 before the alignment film 55 is formed.

The array substrate forming step (S1) includes a TFT layer forming step (S11), a light emitting element layer forming step (S12), an insulating layer forming step (S13), and a pixel electrode forming step (S14) shown in FIG. , Including. In the array substrate forming step (S1), first, the TFT layer 2 is formed on the insulating substrate 1 (S11). Next, a light emitting element layer 3 including a plurality of top emission type light emitting elements 31 is formed on the TFT layer 2 (S12). Next, a translucent insulating layer 4 that covers the light emitting element layer 3 is formed (S13). Next, a pixel electrode 52 is formed for each pixel P on the insulating layer 4 (S14). As a result, the array substrate 10 having the insulating substrate 1, the TFT layer 2, the light emitting element layer 3, the insulating layer 4, and the pixel electrode 52 is formed.

The facing substrate forming step (S2) includes a color conversion layer forming step (S21) and a common electrode forming step (S22) shown in FIG. In the facing substrate forming step (S2), first, the color conversion layer 6 is formed on the insulating substrate 7 (S21). Next, the common electrode 56 is formed on the color conversion layer 6 (S22). As a result, the facing substrate 70 having the insulating substrate 7, the color conversion layer 6, and the common electrode 56 is formed.

Next, as shown in FIG. 5, the array substrate 10 and the opposed substrate 70 are bonded together with a certain gap. As shown in FIG. 5, a liquid crystal aligning agent (monomer 57) containing a liquid crystal material (liquid crystal molecule 54a), a first monomer, and at least one of a second monomer and a third monomer in the gap. ), And a liquid crystal composition containing at least. That is, in the gap, a liquid crystal composition containing at least a liquid crystal material (liquid crystal molecule 54a), a first monomer, and at least one of the second monomer and the third monomer as the monomer 57 is contained. Encapsulate. As a result, the liquid crystal layer 54 is formed in the gap between the array substrate 10 and the opposed substrate 70 (S3, liquid crystal layer forming step). As a result, a liquid crystal cell formed by sandwiching the liquid crystal layer 54 between the array substrate 10 and the opposed substrate 70 is formed.

The liquid crystal injection method may be used or the liquid crystal dropping method may be used to form the liquid crystal layer 54.

When the liquid crystal injection method is used to form the liquid crystal layer 54, first, the array substrate 10 and the facing substrate 70 are bonded together with a sealant, leaving the liquid crystal injection port. Next, the liquid crystal composition is injected from the liquid crystal injection port, and then the liquid crystal injection port is closed. The sealant may be formed on either the array substrate 10 or the opposing substrate 70.

When the liquid crystal dropping method is used to form the liquid crystal layer 54, first, a sealant is applied to the surface of either one of the array substrate 10 and the opposed substrate 70, and the liquid crystal composition is formed in the region surrounded by the sealant. Drop things. After that, the array substrate 10 and the opposed substrate 70 are bonded together with the sealant.

The content of the first monomer in the liquid crystal composition at this time (in other words, the content of the first monomer in the liquid crystal composition before forming the alignment film 53.55 in the alignment film forming step (S4)). The amount) is preferably 0.3 wt% or more and 5 wt% or less. When the content of the first monomer in the liquid crystal composition is less than 0.3 wt%, it may be difficult to obtain a state in which the liquid crystal molecules 54a are uniformly and stably vertically aligned in the liquid crystal layer 54. When the content of the first monomer in the liquid crystal composition is more than 5 wt%, the probability that the unreacted monomer 57 remains in the liquid crystal layer 54 increases, causing a decrease in reliability in the long term. Further, in the alignment film forming step (S4) described later, it takes time for the first monomer to be completely polymerized. As a result, the unreacted monomer 57 may remain, causing a decrease in the voltage retention rate due to the remaining unreacted material.

Further, the total content of the second monomer and the third monomer in the liquid crystal composition before forming the alignment film 53.55 in the alignment film forming step (S4) is 0.01 wt% or more. It is preferably 0.3 wt% or less. When the total content of the second monomer and the third monomer in the liquid crystal composition is less than 0.01 wt%, the second monomer or the third monomer is used in the alignment film forming step (S4) described later. It is difficult to exert the polymerization initiation function of the monomer of the above, and it may take time to complete the polymerization reaction. When the total content of the second monomer and the third monomer in the liquid crystal composition is more than 0.3 wt%, the probability that the unreacted monomer 57 remains in the liquid crystal layer 54 increases. Causes a loss of reliability in the long run. Further, in the alignment film forming step (S4) described later, when the

alignment films

53 and 55 are formed, the polymerization rate is increased due to the generation of a large number of radicals, but the voltage retention rate due to the remaining unreacted material is increased. May cause a drop.

In the liquid crystal composition, the content of the first monomer is preferably equal to or greater than the total content of the second monomer and the third monomer. Specifically, the weight ratio of the first monomer to the second monomer and the third monomer in the monomer 57 is preferably 50: 1 to 1: 1. Here, "the weight ratio of the first monomer to the second monomer and the third monomer" is "weight of the first monomer: total of the second monomer and the third monomer". "Weight" is shown. Further, the liquid crystal composition may contain at least a first monomer and at least one of a second monomer and a third monomer. Therefore, the total weight of the second monomer and the third monomer includes the case where the weight of any one of the second monomer and the third monomer is 0 (zero).

In the liquid crystal composition, in addition to at least one of the liquid crystal material, the first monomer, the second monomer, and the third monomer, as the monomer 57, another monomer copolymerizable with these monomers is further added. It may be included. That is, when forming the

alignment films

53 and 55, the first monomer, at least one of the second monomer and the third monomer, and other monomers other than these monomers are copolymerized. May be good. As a result, the copolymer constituting the

alignment films

53 and 55 is added to the structural unit derived from the first monomer, the structural unit derived from at least one of the second monomer and the third monomer, and the structural unit. It may further contain structural units derived from the other monomers.

Then, as shown in FIG. 5, by causing the light emitting element 31 to emit light, at least the first monomer and at least one of the second monomer and the third monomer are used as described above. , Are copolymerized. As a result, the array substrate 10 is in contact with the liquid crystal layer 54 to form the alignment film 53, while the facing substrate 70 is in contact with the liquid crystal layer 54 to form the alignment film 55 (S4, alignment film forming step). ).

The

alignment films

53 and 55 are formed by copolymerizing at least the first monomer, the second monomer, and at least one of the third monomers to form a liquid crystal layer. It is a layer formed by phase separation from 54. At least one of the second monomer and the third monomer has a polymerization initiation function of absorbing near-ultraviolet to blue light to initiate polymerization. Therefore, by causing the light emitting element 31 to emit light, at least the copolymerization reaction between the first monomer and at least one of the second monomer and the third monomer is started. When the copolymerization reaction is started, the copolymer phase-separated from the liquid crystal layer 54 is deposited in a film shape on the contact surfaces of the array substrate 10 and the opposed substrate 70 with the liquid crystal layer 54. As a result, the

alignment films

53 and 55 are formed.

After the

alignment films

53 and 55 are formed, the liquid crystal layer 54 contains the unreacted monomer 57 as shown in FIG. The unreacted monomer 57 includes at least a first monomer and at least one of the second monomer and the third monomer. Specifically, in the liquid crystal layer 54, as the monomer 57, the first monomer and at least one of the second monomer and the third monomer are 0.0001 wt% to 0.2 wt, respectively. Included in%. In addition, 0.0001 wt% is a detection limit value, and 0.2 wt% indicates a case where the light irradiation time is short. The unreacted monomer 57 can be detected by gas chromatography, liquid chromatography or the like, respectively.

In the above copolymer, alkyl chains are deposited in a certain direction, and liquid crystal molecules 54a are oriented accordingly. The

alignment films

53 and 55 cause the liquid crystal molecules 54a in the liquid crystal material of the liquid crystal layer 54 to be applied to the surfaces of the array substrate 10 and the opposing substrate 70 by the action of the structural unit derived from the first monomer in the copolymer. Can be oriented vertically.

Further, in the present embodiment, as described above, since the

alignment films

53 and 55 are formed after the array substrate 10 and the opposing substrate 70 are bonded together with the sealing material, the sealing material is the array substrate 10 and the opposing substrate 70. It is possible to realize a contacting configuration. Therefore, since the adhesive strength between the sealing material and the array substrate 10 and the opposing substrate 70 is sufficiently ensured, even if the width of the sealing material is reduced in order to narrow the frame, the array substrate 10 and the opposing substrate 70 can be attached to each other. There is also an advantage that it is difficult to peel off between them.

After that, a circularly polarizing plate 8 is formed on the outside of the facing substrate 70 constituting the liquid crystal cell (that is, the side of the facing substrate 70 opposite to the surface facing the array substrate 10) (S5, polarizing plate forming step). ). As a result, the display device 100 shown in FIG. 1 is completed.

When the insulating substrate 1 is a resin film, in the TFT layer forming step (S11), first, a resin film (resin layer) is first formed on the supporting substrate (for example, a glass substrate such as mother glass) as the insulating substrate 1. After the formation, the TFT layer 2 is formed on the insulating substrate 1.

Similarly, when the insulating substrate 7 is a resin film, in the color conversion layer forming step (S21), a resin film (resin layer) is formed as the insulating substrate 7 on the supporting substrate (for example, a glass substrate such as mother glass). After the formation, the color conversion layer 6 is formed on the insulating substrate 7.

Therefore, when the insulating substrate 1 is a resin film, the support substrate is provided on the surface of the array substrate 10 opposite to the opposing substrate 70. When the insulating substrate 7 is a resin film, the support substrate is provided on the surface of the facing substrate 70 opposite to the array substrate 10. Therefore, in the polarizing plate forming step (S5), when the support substrate is provided on the surface of the opposed substrate 70 opposite to the array substrate 10, at least the support substrate provided on the opposed substrate 70 is peeled off and then the support substrate is peeled off. The circular polarizing plate 8 is formed.

Next, the present embodiment will be described in more detail with reference to Examples and Comparative Examples. However, this embodiment is not limited to the following examples.
[Example 1]
First, a polyimide layer was formed as a resin film to be an insulating substrate (flexible substrate) on a glass substrate as a support substrate. Next, on the polyimide layer, a TFT layer, a blue OLED layer provided with a plurality of blue OLEDs as light emitting elements, an insulating layer, and an ITO electrode as a pixel electrode were formed in this order. As a result, an alignment film-less array substrate was produced as the array substrate.

On the other hand, a polyimide layer was formed as a resin film to be an insulating substrate (flexible substrate) on a glass substrate as a support substrate, and a color conversion layer and an ITO electrode as a common electrode were formed on the polyimide layer in this order. As a result, a facing substrate without an alignment film was produced as a facing substrate. In the color conversion layer 6, a red color conversion layer 6R was formed corresponding to the pixel RP, and a green color conversion layer 6G was formed corresponding to the pixel GP. A blue color filter was formed on the remaining portion of the color conversion layer 6 corresponding to the pixel BP.

Subsequently, the array substrate and the facing substrate were bonded together with a sealant with a certain gap. On the other hand, as the liquid crystal composition, the liquid crystal material, the first monomer, the vertically oriented monomer represented by the structural formula (1-1), and the anthracene-based monomer represented by the structural formula (2-1) (polymerization). A mixture with the initiator) was prepared. At this time, in the liquid crystal material and each of the monomers, the content of the vertically oriented monomer in the liquid crystal composition is 2 wt%, and the content of the anthracene-based monomer in the liquid crystal composition is 0.1 wt%. It was mixed so as to be.

Next, the liquid crystal composition was vacuum-injected into the gap, and the liquid crystal composition was sealed between the array substrate and the facing substrate to form a liquid crystal layer.

Subsequently, the blue OLED was lit at room temperature (25 ° C.) for 10 minutes to perform photopolymerization, and an alignment film was formed on each of the contact surfaces of the array substrate and the facing substrate with the liquid crystal layer. Next, the glass substrate on the outside of the liquid crystal cell composed of the array substrate, the liquid crystal layer, and the opposed substrate was peeled off by laser peeling the glass substrate from the array substrate and the opposed substrate, respectively. Finally, the display device according to this embodiment was produced by laminating a circularly polarizing plate on the polyimide layer on the opposite substrate side in the liquid crystal cell from which the glass substrate was peeled off.

FIG. 6 shows the emission spectrum of the blue OLED used in this example. Note that FIG. 6 shows an emission spectrum when standardized with the maximum intensity set to 1.

Further, FIG. 7 shows the absorption spectrum of the anthracene-based monomer used in this example.

Further, by sandwiching the liquid crystal cell before peeling the glass substrate between cross Nicol polarizers whose transmission axis directions are orthogonal to each other and observing the light transmission state of the liquid crystal cell, the orientation of the liquid crystal molecules in the liquid crystal layer is observed. I checked the status. The light transmission states of the liquid crystal cells before and after lighting of the blue OLED (in other words, before and after the formation of the alignment film) observed in this manner when no voltage is applied are shown side by side in FIG.

As shown in FIG. 8, when observed from directly above the liquid crystal cell, it can be seen that after the blue OLED is lit, no light is transmitted and the liquid crystal molecules are vertically oriented. Therefore, from the above results, it can be seen that the vertically oriented monomer and the anthracene-based monomer were copolymerized with the blue light of the blue OLED to form a vertically oriented film.

Further, the liquid crystal element and the OLED obtained in this manner have high brightness when displayed by the OLED and high contrast when displayed by the liquid crystal element, so that long-term reliability is improved and the appearance when displayed by the liquid crystal element is improved. Turned out to be better.

[Example 2]
In this embodiment, as the liquid crystal composition, the liquid crystal material, the first monomer, the vertically oriented monomer represented by the structural formula (1-1), and the benzyl system represented by the structural formula (3-1) are used. A mixture with a monomer (polymerization initiator) was prepared. At this time, the liquid crystal material and each of the monomers have a content of the vertically oriented monomer of 1.2 wt% in the liquid crystal composition, and the content of the benzyl-based monomer in the liquid crystal composition is 0. It was mixed so as to be 1 wt%.

Except that, in Example 1, a liquid crystal layer is formed by bonding the array substrate and the opposing substrate with a sealant with a certain gap and then enclosing the liquid crystal composition in the gap. , A display device according to this example was produced in the same manner as in Example 1.

FIG. 9 shows the absorption spectrum of the benzyl-based monomer used in this example. The emission spectrum of the blue OLED used in this example is the same as the emission spectrum of the blue OLED shown in FIG. 7 used in Example 1. Further, the absorption spectrum of the vertically oriented monomer used in this example is the same as the absorption spectrum of the vertically oriented monomer shown in FIG. 8 used in Example 1.

Further, as in the first embodiment, the liquid crystal cell obtained in this example before peeling the glass substrate is sandwiched between the cross Nicol polarizers whose transmission axis directions are orthogonal to each other, and the light transmitting state of the liquid crystal cell is sandwiched. The orientation state of the liquid crystal molecules in the liquid crystal layer was confirmed by observing. The light transmission states of the liquid crystal cells before and after lighting of the blue OLED (in other words, before and after the formation of the alignment film) observed in this manner when no voltage is applied are shown side by side in FIG.

As shown in FIG. 10, when observed from directly above the liquid crystal cell, it can be seen that after the blue OLED is lit, no light is transmitted and the display state is black, and the liquid crystal molecules are vertically oriented. As described above, even when the benzyl-based monomer is used as the polymerization initiator, the vertically-aligned monomer and the benzyl-based monomer can be copolymerized with the blue light of the blue OLED to form a vertically oriented film. I was able to do it.

[Comparative Example 1]
In this comparative example, as the liquid crystal composition, the liquid crystal material, the first monomer, the vertically oriented monomer represented by the structural formula (1-1), and the biphenyl-based monomer represented by the following structural formula (6) are used. A mixture of the above was prepared.

At this time, in the liquid crystal material and each of the monomers, the content of the vertically oriented monomer in the liquid crystal composition is 2 wt%, and the content of the biphenyl-based monomer in the liquid crystal composition is 0.1 wt%. It was mixed so as to be.

The biphenyl-based monomer is an ultraviolet-polymerizable monomer used in PSA (Polymer Sustained Alignment) technology. In PSA technology, a liquid crystal material containing a photopolymerizable monomer is sealed in a liquid crystal panel, and a voltage is applied to the liquid crystal layer, and an active energy ray such as ultraviolet rays is irradiated to obtain the photopolymerizable monomer. It is a technique to polymerize.

Except that, in Example 1, a liquid crystal layer is formed by bonding the array substrate and the opposing substrate with a sealant with a certain gap and then enclosing the liquid crystal composition in the gap. , A display device according to this comparative example was produced in the same manner as in Example 1.

Further, as in the first embodiment, the liquid crystal cell obtained in this comparative example before peeling the glass substrate is sandwiched between the cross Nicol polarizers whose transmission axis directions are orthogonal to each other, and the light transmitting state of the liquid crystal cell is sandwiched. The orientation state of the liquid crystal molecules in the liquid crystal layer was confirmed by observing. The light transmission states of the liquid crystal cells before and after lighting of the blue OLED (in other words, before and after the formation of the alignment film) observed in this manner when no voltage is applied are shown side by side in FIG.

As shown in FIG. 11, when observed from directly above the liquid crystal cell, light is transmitted through the liquid crystal cell even after the blue OLED is lit, and the black display state is not realized. Therefore, it can be seen that the liquid crystal molecules are not vertically oriented. As described above, in this comparative example, an attempt was made to form an alignment film by combining the above-mentioned vertically oriented monomer with the above-mentioned biphenyl-based monomer and irradiating with visible light, but the liquid crystal molecules could not be vertically oriented and none. It remained oriented. Therefore, it was determined that even if the vertically oriented monomer was combined with the biphenyl-based monomer, the vertically oriented film could not be formed, and the liquid crystal element for displaying by the VA method could not be formed.

[Comparative Example 2]
In this comparative example, as the liquid crystal composition, a mixture of the liquid crystal material and the vertically oriented monomer represented by the structural formula (1-1), which is the first monomer, was prepared.

At this time, the liquid crystal material and the vertically oriented monomer were mixed so that the content of the vertically oriented monomer in the liquid crystal composition was 2 wt%.

As shown in FIG. 12, when observed from directly above the liquid crystal cell, light is transmitted through the liquid crystal cell even after the blue OLED is lit, and the black display state is not realized. Therefore, it can be seen that the liquid crystal molecules are not vertically oriented. As described above, in this comparative example, an attempt was made to polymerize the vertically oriented monomer by irradiation with visible light to form an alignment film, but the liquid crystal molecules could not be vertically oriented and remained unaligned. .. Therefore, it was determined that the vertically oriented monomer could not be used alone to form the vertically oriented film, and the liquid crystal element for displaying by the VA method could not be formed.

[Comparative Example 3]
First, in the same manner as in Example 1, the polyimide layer, the TFT layer, the blue OLED layer, the insulating layer, and the ITO electrode are formed on the glass substrate in this order, so that the array substrate is oriented in the same manner as in Example 1. A filmless array substrate was produced. Then, in order to form an alignment film, a polyamic acid solvent was spin-coated on the surface of the array substrate on the ITO electrode forming side, and the surface was heated and fired at 230 ° C. for 60 minutes. As a result, an alignment film was formed on the surface of the array substrate.

On the other hand, by forming the polyimide layer, the color conversion layer, and the ITO electrode on the glass substrate in this order in the same manner as in Example 1, an alignment film-less facing substrate similar to that in Example 1 can be formed as the facing substrate. Made. Then, in order to form an alignment film, a polyamic acid solvent was spin-coated on the surface of the facing substrate on the ITO electrode forming side, and the surface was heated and fired at 230 ° C. for 60 minutes. As a result, an alignment film was formed on the surface of the facing substrate.

Next, a sealant is applied to the surface of the array substrate on the alignment film forming side, a liquid crystal material is dropped into the region surrounded by the sealant, and then the opposing substrates are bonded to each other to form a vertically oriented liquid crystal. A layer was formed.

After that, by peeling the glass substrate from the array substrate and the opposing substrate, the outer glass substrate of the liquid crystal cell composed of the array substrate, the liquid crystal layer, and the opposing substrate was peeled by laser.

When the display by the liquid crystal element formed in this way was confirmed in the same manner as in Example 1, uneven orientation was observed. It is considered that the reason for this is that thermal expansion of the polyimide layer, which is a flexible substrate, has partially occurred.

As described above, according to the present embodiment, the liquid crystal molecules 54a can be vertically aligned without high-temperature firing and without irradiating light from the array substrate 10 side or the opposing substrate 70 side. The

films

53 and 55 can be formed. As a result, as the display device 100, it is possible to manufacture the display device 100 that displays the liquid crystal element 51 by the vertical alignment method (for example, the VA method).

<Modification example 1>
In this embodiment, the case where the light emitting element 31 is an OLED has been described as an example. However, the light emitting element 31 may be a QLED (quantum dot light emitting diode) using quantum dots (QD) as a light emitting material. When the light emitting element 31 is a QLED, a QD light emitting layer containing a QD made of semiconductor nanoparticles is used as the light emitting layer. Further, an inorganic layer is preferably used as the layer other than the light emitting layer in the functional layer 33.

When the light emitting element 31 is an OLED, holes and electrons are recombined in the light emitting layer by the driving current between the first electrode 32 and the second electrode 34, and the excitons generated thereby transition to the basal state. Light is emitted in the process.

On the other hand, when the light emitting element 31 is a QLED, holes and electrons are recombined in the light emitting layer by the driving current between the first electrode 32 and the second electrode 34, and the excitons generated by this are the QD. Light is emitted in the process of transitioning from the conduction band level to the valence band level.

Further, as the light emitting element 31, a light emitting element other than the OLED and the QLED (for example, an inorganic light emitting diode or the like) may be formed.

<Modification 2>
Further, in the present embodiment, the case where the color conversion layer 6 is provided on the array substrate 10 side of the opposed substrate 70 has been described as an example, but the present embodiment is not limited to this. The color conversion layer 6 may be provided, for example, directly above the light emitting element layer 3 on the array substrate 10. However, in this case, if the insulating layer 4 is an inorganic layer, it is difficult to form a uniform color conversion layer 6 due to the influence of unevenness due to the formation of the light emitting element 31, which causes display unevenness. Therefore, in this case, it is desirable that the insulating layer 4 is a flattening layer.

The color conversion layer 6 can also be provided on the side of the facing substrate 70 opposite to the array substrate 10 (in other words, the side of the insulating substrate 7 opposite to the surface facing the insulating substrate 1). However, the thickness of the insulating substrate 7 is usually 0.1 mm or more, and the distance from the light emitting layer of the light emitting element 31 to the color conversion layer 6 becomes long. Therefore, the color viewing angle characteristic is deteriorated. Therefore, it is desirable that the color conversion layer 6 is provided on the array substrate 10 side of the opposed substrate 70.

<Modification example 3>
In FIG. 1, a case where a circularly polarizing plate 8 is provided on the outside of the opposing substrate 70 as a polarizing plate has been described as an example. However, the present embodiment is not limited to this, and a linear polarizing plate may be provided with the liquid crystal element layer 5 interposed therebetween. However, in this case, the light emitting element 31 needs to be always on.

That is, in the present embodiment, the case where the display device 100 includes a reflective liquid crystal element as the liquid crystal element 51 has been described as an example. However, the present embodiment is not limited to this, and the display device 100 according to the present embodiment may include

alignment films

53 and 55 using the liquid crystal alignment agent. Therefore, the display device 100 according to the present embodiment may be a display device having a light emitting element 31 as a backlight, or may include a transmissive liquid crystal element as the liquid crystal element 51.

<Modification example 4>
Further, in the present embodiment, the case where the liquid crystal element 51 is, for example, a liquid crystal element that displays by the VA method has been described as an example.

The liquid crystal element 51 has a higher contrast in the vertical orientation than in the horizontal orientation, and there is less discomfort with the light emitting element 31 such as an OLED which originally has a high contrast. As described above, since the light emitting element 31 emits only blue light, there is no need to divide the color pixels in the light emitting element 31, and a large area in the pixel P can be used as the light emitting element 31.

However, the liquid crystal element 51 may be, for example, a liquid crystal element that displays by an IPS (inplane switching) method. In the IPS system, the liquid crystal molecules 54a are rotated in parallel to the array substrate 10 and the facing substrate 70 by a transverse electric field in the in-plane direction.

The liquid crystal alignment agent can be suitably used as an alignment film material even when the liquid crystal element 51 is oriented by a transverse electric field in this way. In this case, as the liquid crystal material, a liquid crystal material in which the liquid crystal molecules 54a have positive dielectric anisotropy is used.

<Modification 5>
Further, in the present embodiment, the case where all the light emitting elements 31 are light emitting elements that emit near-ultraviolet to blue light has been described as an example. However, the light emitting element layer 3 may further include, as the light emitting element 31, a red light emitting element that emits red light and a green light emitting element that emits green light, in addition to the above light emitting element.

However, even in that case, it is desirable to make the light emitting region of the light emitting element that emits near-ultraviolet to blue light as wide as possible. By widening the light emitting region of the light emitting element that emits near-ultraviolet to blue light as much as possible, it is not necessary to make the light emitting element 31 have ultra-high brightness, which is advantageous in terms of reliability.

Further, as described above, the

alignment films

53 and 55 are polymerization orientation layers that polymerize with near-ultraviolet to blue light. The

alignment films

53 and 55 are difficult to polymerize with the light emitted from the red light emitting element and the green light emitting element. Therefore, it is desirable that the entire light emitting area of the light emitting element layer 3 emits near-ultraviolet to blue light, and it is desirable that the entire liquid crystal layer 54 is uniformly irradiated with blue light. By widening the light emitting region of the light emitting element that emits near-ultraviolet to blue light in this way, as described above, the monomer 57 in the liquid crystal layer 54 is uniformly polymerized when the

alignment films

53 and 55 are formed. It can be carried out.

The present disclosure is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present disclosure. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.

1 Insulated substrate (first insulated substrate)
2 TFT layer (thin film transistor layer)
3 Light emitting element layer 4 Insulation layer 5 Liquid

crystal element layer

6, 6R, 6G, 6B color conversion layer 7 Insulation substrate (second insulation substrate)
8-circular polarizing plate (polarizing plate)
10 Array substrate 31 Light emitting element 32 First electrode 33 Functional layer (light emitting layer)
34 Second electrode 51 Liquid crystal element 52 Pixel electrode 54 Liquid crystal layer 54a Liquid crystal molecule 53 Alignment film (first alignment film)
55 Alignment film (second alignment film)
56 Common electrode 57 Monomer 70 Opposing substrate 100 Display device

Claims

An alignment film that orients the liquid crystal
The alignment film has at least the following general formula (1).

(In the equation, X 1 and X 2 independently represent -H, -CH 3 , or -C 2 H 5 , where Z is -O-, -S-, -NH-, -CO-. , -COO-, -OCO-, or a direct bond, where Y 1 and Y 2 are independently -H, -F, -Cl, -Br, linear, branched with 1 to 6 carbon atoms. A linear or cyclic alkyl group or a linear, branched or cyclic alkyloxy having 1 to 6 carbon atoms is represented, m represents an integer of 6 to 16, and n represents an integer of 8 to 24. )
The first monomer represented by and the following general formula (2)

(In the formula, R 1 and R 2 independently represent a hydrogen atom or a methyl group)
The second monomer represented by and the following general formula (3)

(In the formula, R 3 and R 4 independently represent a hydrogen atom or a methyl group)
An alignment film comprising a copolymer with at least one of the third monomers represented by.
The first monomer has the following structural formulas (1-1) to (1-8).

The alignment film according to claim 1, wherein the alignment film contains at least one of the monomers represented by.
The second monomer has the following structural formulas (2-1) and (2-2).

The alignment film according to claim 1 or 2, wherein the alignment film contains at least one of the monomers represented by.
The third monomer has the following structural formulas (3-1) and (3-2).

The alignment film according to any one of claims 1 to 3, wherein the alignment film contains at least one of the monomers represented by.
Any of claims 1 to 4, wherein at least one of the second monomer and the third monomer is a polymerization initiator that absorbs near-ultraviolet to blue light and initiates polymerization. The alignment film according to item 1.
A claim characterized in that at least one of the second monomer and the third monomer is a polymerization initiator that absorbs light having a wavelength band of 360 nm or more and 500 nm or less to initiate polymerization. Item 2. The alignment film according to any one of Items 1 to 5.
The above copolymer has the following structural formula (4).

(In the equation, X 1 and X 2 independently represent -H, -CH 3 , or -C 2 H 5 , where Z is -O-, -S-, -NH-, -CO-. , -COO-, -OCO-, or a direct bond, where Y 1 and Y 2 are independently -H, -F, -Cl, -Br, linear, branched with 1 to 6 carbon atoms. Represents a linear or cyclic alkyl group or a linear, branched or cyclic alkyloxy having 1 to 6 carbon atoms, and R 1 and R 2 independently represent a hydrogen atom or a methyl group, respectively. Represents an integer of 6 to 16, n represents an integer of 8 to 24, p represents an integer of 1 to 100, q represents an integer of 1 to 50, and r represents an integer of 1 to 100. Represents an integer, s represents an integer from 1 to 100)
The alignment film according to any one of claims 1 to 6, which comprises a copolymer represented by.
The above copolymer has the following structural formula (5).

(In the equation, X 1 and X 2 independently represent -H, -CH 3 , or -C 2 H 5 , where Z is -O-, -S-, -NH-, -CO-. , -COO-, -OCO-, or a direct bond, where Y 1 and Y 2 are independently -H, -F, -Cl, -Br, linear, branched with 1 to 6 carbon atoms. Represents a linear or cyclic alkyl group or a linear, branched or cyclic alkyloxy having 1 to 6 carbon atoms, and R 3 and R 4 independently represent a hydrogen atom or a methyl group, m. Represents an integer of 6 to 16, n represents an integer of 8 to 24, p represents an integer of 1 to 100, q represents an integer of 1 to 50, and r represents an integer of 1 to 100. Represents an integer, s represents an integer from 1 to 100)
The alignment film according to any one of claims 1 to 7, wherein the alignment film contains the copolymer represented by.
Between the first insulating substrate and the second insulating substrate, a thin film transistor layer having a plurality of thin film transistors, a light emitting element layer having a plurality of light emitting elements, a first alignment film, a liquid crystal layer, and a second The alignment film of the above is provided in this order from the first insulating substrate side.
A display device according to any one of claims 1 to 8, wherein at least one of the first alignment film and the second alignment film is the alignment film according to any one of claims 1 to 8.
The display device according to claim 9, wherein the liquid crystal layer contains the first monomer, the second monomer, and at least one of the third monomers.
The display device according to claim 9 or 10, wherein the liquid crystal layer is a vertically oriented liquid crystal layer.
The display device according to any one of claims 9 to 11, further comprising a polarizing plate.
The above polarizing plate is a circular polarizing plate.
The display device according to claim 12, wherein the polarizing plate is provided on the opposite side of the other insulating substrate of the pair of insulating substrates from the one insulating substrate.
The display device according to any one of claims 9 to 13, wherein the light emitting element is a light emitting element that emits near-ultraviolet to blue light.
The display device according to any one of claims 9 to 14, wherein the light emitting element is a light emitting element that emits light having a wavelength band of 360 nm or more and 500 nm or less.
Contains multiple pixels
The display device according to any one of claims 9 to 15, wherein the light emitting element is formed for each of the pixels and emits light in a color common to the plurality of pixels.
The light emitting element is a light emitting element that emits blue light.
The plurality of pixels include a red pixel that emits red light, a green pixel that emits green light, and a blue pixel that emits blue light.
The red pixel includes a red color conversion layer that converts the light emitted from the light emitting element into red light.
The display device according to claim 16, wherein the green pixel includes a green color conversion layer that converts light emitted from the light emitting element into green light.
The light emitting element is a light emitting element that emits near-ultraviolet light.
The plurality of pixels include a red pixel that emits red light, a green pixel that emits green light, and a blue pixel that emits blue light.
The red pixel includes a red color conversion layer that converts the light emitted from the light emitting element into red light.
The green pixel includes a green color conversion layer that converts the light emitted from the light emitting element into green light.
The display device according to claim 16, wherein the blue pixel includes a blue color conversion layer that converts light emitted from the light emitting element into blue light.
The display device according to claim 17 or 18, wherein a color conversion layer is provided between the second alignment film and the second insulating substrate.
The method for manufacturing a display device according to any one of claims 9 to 19.
A step of forming an array substrate having the first insulating substrate, the thin film transistor layer, and the light emitting element layer.
The step of forming the facing substrate having the second insulating substrate and
A liquid crystal composition containing at least a liquid crystal material, the first monomer, and at least one of the second monomer and the third monomer is encapsulated between the array substrate and the facing substrate. And the process of forming a liquid crystal layer
By causing the light emitting element to emit light, at least the first monomer, the second monomer, and at least one of the third monomers are copolymerized, and the liquid crystal is formed on the array substrate. A display device comprising a step of contacting a layer to form the first alignment film, while the opposing substrate includes a step of contacting the liquid crystal layer to form the first alignment film. Production method.
The content of the first monomer in the liquid crystal composition before forming the first alignment film and the second alignment film is 0.3 wt% or more and 5 wt% or less. The method for manufacturing a display device according to claim 20.
The total content of the second monomer and the third monomer in the liquid crystal composition before forming the first alignment film and the second alignment film is 0.01 wt% or more, 0. The method for manufacturing a display device according to claim 20 or 21, wherein the content is 3 wt% or less.
The following general formula (1)

(In the equation, X 1 and X 2 independently represent -H, -CH 3 , or -C 2 H 5 , where Z is -O-, -S-, -NH-, -CO-. , -COO-, -OCO-, or a direct bond, where Y 1 and Y 2 are independently -H, -F, -Cl, -Br, linear, branched with 1 to 6 carbon atoms. A linear or cyclic alkyl group or a linear, branched or cyclic alkyloxy having 1 to 6 carbon atoms is represented, m represents an integer of 6 to 16, and n represents an integer of 8 to 24. )
The first monomer represented by and the following general formula (2)

(In the formula, R 1 and R 2 independently represent a hydrogen atom or a methyl group)
The second monomer represented by and the following general formula (3)

(In the formula, R 3 and R 4 independently represent a hydrogen atom or a methyl group)
A liquid crystal alignment agent comprising at least one of the third monomers represented by.
A liquid crystal composition comprising the liquid crystal alignment agent according to claim 23 and a liquid crystal material.